基于at89c51秒表-课程设计

南开大学滨海学院微控制器原理及应用实验课程设计（论文）题目：基于AT89C51的秒表学号：__11990624___姓名：___袁贺鹏______年级：___2011级___专业：通信工程系别：___电子科学系______指导教师：__高艺司敏山赵二刚_完成日期：___2013年12月_________功能描述：该单片机通过单片机的内部中断实现简单的秒表计时功能。从而实现时间计量的问题。原理概述：通过单片机的内部程序实现一个端口接开关，其余端口接数码管，实现计时功能。端口说明：单片机P1口接8位数码管的段码，单片机的P2.0到P2.7接数码管的位码选择端。单片机int0，int1中断，接两个按键。该单片机复位为高电平复位。效果显示总电路图：程序清单LEDBUFEQU30H ;为显示数据开辟内存单元ORG0000HLJMPMAINORG0003HLJMPINTRUPER0ORG000BHLJMPTIME0ORG0013HLJMPINTRUPER1ORG001BHLJMPTIME1ORG0030HTABLE:DB0C0H,0F9H,0A4H,0B0H,99HDB92H,82H,0F8H,80H,90H ;7段数码管译码表 DB3FHMAIN:MOVSP,#70H ;初始化堆栈MOVLEDBUF,#0 MOVLEDBUF+1,#0 MOVLEDBUF+2,#0AH MOVLEDBUF+3,#0 MOVLEDBUF+4,#0 MOVLEDBUF+5,#0AH MOVLEDBUF+6,#0 MOVLEDBUF+7,#0 ;写入要显示的数字MOVR0,#LEDBUF ;将ledbuf的首地址给R0MOVDPTR,#TABLE ;将TABLE的首是址给DPTR MOVR7,#0AH MOVR6,#0AH MOVR5,#0AH MOVR4,#06H MOVR3,#0AH MOVR2,#08H ;R2作为循环次数寄存器 MOVR1,#01H ;R1中放片选信号MOVTMOD,#51H ;定时器0工作在方式1 MOVTH0,#0EFH MOVTL0,#0FFH MOVTH1,#0D8H MOVTL1,#0F0H ;初始代定时器0 SETBTR0 SETBTR1 ;开定时器0 SETBEA ;开总中断 SETBET0 SETBET1 SETBEX0 SETBEX1 ;开定时器0中断 MAIN1:JBP3.0,STARTSJMPMAIN1START:MOVLEDBUF,#0 MOVLEDBUF+1,#0 MOVLEDBUF+2,#0AH MOVLEDBUF+3,#0 MOVLEDBUF+4,#0 MOVLEDBUF+5,#0AH MOVLEDBUF+6,#0 MOVLEDBUF+7,#0 SJMPMAIN1 ;动态停机TIME0:DJNZR2,LOOP1 ;循环6次后回到初始值继续循环，小于6次跳到LOOP1 MOVR2,#08H MOVR1,#01H MOVR0,#LEDBUF ;初始化数据LOOP1:MOVTH0,#0EFHMOVTL0,#0FFH ;初始化定时器0 MOVA,R1 MOVP1,A RLA MOVR1,A ;将R1中片选信号输入P1并且使其数据左移一位 MOVA,@R0 MOVCA,@A+DPTR MOVP2,A INCR0 ;通过查表将ledbuf中数据送往P2 RETITIME1:MOVTH1,#0D8H MOVTL1,#0F0H DJNZR7,LOOP2 MOVR7,#0AH MOVLEDBUF+7,#00H DJNZR6,LOOP3 MOVR6,#0AH MOVLEDBUF+6,#00H DJNZR5,LOOP4 MOVR5,#0AH MOVLEDBUF+4,#00H DJNZR4,LOOP5 MOVR4,#06H MOVLEDBUF+3,#00H DJNZR3,LOOP6 MOVLEDBUF+1,#00H MOVR3,#0AH INCLEDBUF MOVA,#0AH CJNEA,LEDBUF,EXIT MOVLEDBUF,#0 MOVLEDBUF+1,#0 MOVLEDBUF+2,#0AH MOVLEDBUF+3,#0 MOVLEDBUF+4,#0 MOVLEDBUF+5,#0AH MOVLEDBUF+6,#0 MOVLEDBUF+7,#0 LJMPEXITLOOP6:INCLEDBUF+1 LJMPEXITLOOP5:INCLEDBUF+3 LJMPEXITLOOP4:INCLEDBUF+4 LJMPEXITLOOP3:INCLEDBUF+6 LJMPEXITLOOP2:INCLEDBUF+7 EXIT: RETI ;写入要显示的数字INTRUPER0:MOVLEDBUF,#0 MOVLEDBUF+1,#0 MOVLEDBUF+2